Vitamin d is a vitamin and pro hormone that is synthesised by the body when our skin is exposed to uvb sunlight less than 10 of our supply comes from natural foods as our bodies were developing many thousands of years ago this was a simple and straight forward process suitable for vegetarians peppermint flavourr vitamin d for humans this is d3 is essential along with magnesium to absorb calcium without d3 and magnesium calcium is simply not soluble it will not enter our bones